[ MAC VENDOR DIRECTORY ]

MAC Address Vendor Directory

Every network interface ships with a MAC address, and the first half of that address — the OUI (Organizationally Unique Identifier) — is assigned by the IEEE to the company that built the hardware. This directory maps those OUI assignments back to the manufacturers behind them, with a researched profile for each vendor: who they are, what kinds of devices the prefix shows up on, and which specific OUI ranges they hold.

A vendor appears here once its profile has been researched and verified against the IEEE registry — so every entry is a real write-up, not an auto-generated stub. The directory grows as more vendors are researched.

Looking for a specific address? The MAC Address Lookup tool resolves any MAC or OUI prefix instantly, even for manufacturers not yet profiled here.

1359 vendors profiled and growing.

// top vendors by assignment count

// profiled vendors · ranked by assignment count

How a MAC address identifies hardware.

A MAC address is the identifier burned into a network interface at the factory. It is six bytes long, usually written as 00:1A:2B:3C:4D:5E. The first three bytes are the OUI, the Organizationally Unique Identifier, which the IEEE assigns to the company that made the hardware. The remaining three are assigned by that company to individual devices.

That split is what makes the first half useful. Given any MAC address, the OUI tells you which manufacturer built the interface, even when nothing else on the device identifies it.

Why you would look one up

The usual reason is an unfamiliar device. A DHCP lease table or a router's client list shows a MAC address and little else, and the question is what the thing actually is. Resolving the OUI to a manufacturer narrows it fast, because a printer vendor and a security-camera vendor point somewhere different.

Two things complicate this. Modern phones and laptops use randomised MAC addresses when scanning for or joining wireless networks, and a randomised address has a locally administered bit set and belongs to no vendor at all. Software can also override a hardware address, so a MAC is evidence about a device rather than proof of one.

What a profiled vendor page contains

Each vendor linked above has a page written from the IEEE registry plus public information about the company: what it makes, which device types its prefixes appear on, and every OUI range recorded against it. Large manufacturers hold dozens of separate assignments, and those are consolidated onto a single page rather than scattered across one page per prefix.

A vendor is listed here only once that research exists. Registrations with no findable company behind them are left out rather than published as an empty record with a name at the top.

Related lookups

To resolve a specific address, use the MAC Address Lookup, which covers the whole IEEE registry including manufacturers with no profile here yet. For the network side of the same question, the IP Lookup identifies the operator behind an address and the ASN directory lists the networks researched so far. MAC addresses explained covers the format in more depth.